ncdu (NCurses Disk Usage) is a curses-based version of the well-known du, and provides a fast way to see what directories are using your disk space.

Excerpt from tldr.sh: The tldr pages are a community effort to simplify the beloved man pages with practical examples. Get more information at tldr-pages at GitHub.

Are you, as I, suffering from Detected Hardware Unit Hang in the kernel log from an e1000e network card? How do you notice it. A transfer goes to zero bytes for around 10 seconds, then restarts, then goes to zero, then restarts and so on…

From the website: The Portable Hardware Locality (hwloc) software package provides a portable abstraction (across OS, versions, architectures, …) of the hierarchical topology of modern architectures, including NUMA memory nodes, sockets, shared caches, cores and simultaneous multithreading. It also gathers various system attributes such as cache and memory information as well as the locality of I/O devices such as network interfaces, InfiniBand HCAs or GPUs.

Oneliner to list your CPU vulnerabilities and mitigations. Read more about the different vulnerabilities and mitigations at Hardware vulnerabilities.

Installing a small Debian VM from scratch with only one partition. Makes later resizing easier. This was done on Fedora 32. Preparations 🔗Install software 🔗libvirt is already installed on Fedora 32. It’s used in Gnome Boxes. We will not use that for this. We’ll do it the old fashioned way with virt-install.

Libvirt is the default toolkit to manage virtualization platforms on Linux. Libvirt and qemu is a great combination with Vagrant. It’s the default combination on most Linux systems, also on my favorite - Fedora. This combination allows for some awesome features and some restrictions. One of the restrictions is that Ubuntu isn’t available as a box, but Debian is.

Vagrant is a great way to script development environments for system administrators. It works with full virtualization and is closer to the real hardware than container systems. There is a bug in the latest version of Ubuntu (Vagrant Box) that makes it hang during boot. It even hangs the VirtualBox and makes the GUI misbehave.

The only way to be safe for ransomware, except for keeping a offline backup, is to have a immutable online backup. restic is a deduplication backup sofware, designed for ease of use and security. Rclone is a versatile program for syncing data between a huge variety of protocols and cloud providers.

Your private SSH key is the key for the kingdom. This means always having a password on the key. With YubiKey, you can keep your secret key outside your machine too. Excerpt from Wikipedia: The YubiKey allows users to sign, encrypt and decrypt messages without exposing the private keys to the outside world.